Alloy 825
2.4858 – N08825

HomeMaterials2.4858

Material description

The material 2.4858 is a titanium-stabilised, nickel-iron-chromium alloy with the additional alloying elements copper and molybdenum.

2.4858 (Alloy 825) has a number of positive material properties. The construction material is very resistant to acids and alkalis – even under oxidising and reducing conditions. 2.4858 has good corrosion resistance in various media such as sulphuric, nitric, phosphoric and organic acids as well as in ammonia, seawater and chloride alkalis.

Due to its nickel content, the alloy is also extremely resistant to chloride-induced stress corrosion cracking. The material also has good resistance to chloride-induced pitting and crevice corrosion. The good toughness at high temperatures up to approx. 550 °C rounds off the positive properties of the material.

AN OVERVIEW OF THE PROPERTIES OF 2.4858:

  • Good resistance to (chloride-induced) stress corrosion cracking
  • Good resistance to (chloride-induced) pitting and crevice corrosion
  • Good toughness up to approx. 550 °C (even in continuous operation)
  • Very good resistance to acids and alkalis (e.g. sulphuric, nitric and phosphoric acid, ammonia, seawater)

Applications

  • Components for aircraft engines (e.g. hardware, nozzles, partitions)
  • Moulds in pressing technology

Material data

Material no.: 2.4858
Name: Alloy 825
UNS no.: N08825
ASTM: B425 / B564
VdTÜV: 432/3
Other: DIN 17744/17752
Material type: Corrosion-resistant alloy

Chemical composition in %

ASTM B425/564VdTÜV Material sheet 432DIN 17744
Ni38,0 – 46,038,0 – 46,038,0 – 46,0
Cr19,5 – 23,519,5 – 23,519,5 – 23,5
Fe22,0 min.RestRest
Mn, max.1,01,001,00
C, max.0,050,0250,025
Cu1,5 – 3,01,50 – 3,001,5 – 3,0
Si, max.0,50,500,50
S, max.0,030,0100,015
Al, max.0,20,200,20
Ti0,6 – 1,20,60 – 1,200,60 – 1,20
Mo2,5 – 3,52,50 – 3,502,5 – 3,5
P, max.0,0200,020
Co, max.1,00

Mechanical properties

Soft-annealedBar | forging
ASTM B425 | ASTM B564
Bar | forging
D ≤ 240 mm
Bar D ≤ 160 mm
DIN 17752
Rm (MPa)≥ 586550 – 750≥ 590
Rp 0,2 (MPa)≥ 241≥ 220≥ 240
Rp 1,0 (MPa)≥ 250≥ 270
A (%)≥ 30≥ 35≥ 30
Av (J)l ≥ 120, q/t ≥ 80
Hardness (HBW 2,5/62,5)max. 210

The specified values are non-binding guide values.

Data sheet